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A signal will assert on gdo pins when the number of bytes in the FIFO is equal to or higher than the programmed threshold.
Purpose of this remind you the operating time,first you should understand what's the fifo_thr means.
Thanks for your reply.Exactly I didn't understand why the Num_Bytes in Figure 27 go back to the normal range(lower than threshold) automaticly。Infact it's not "automaticly " goes back to normal range,but because of the operating of the FIFO.Thanks again.
这个是设置fifo的报警阈值,并不是最大值。注意因为rx在接受的时候fifio越来越满,当小于9个byte时会置高,总的是64个字节。 tx 正好相反,fifo会越来越空,所以快空的时候会报警,如果你设置了相应的寄存器的话